Shadowhunters Flufftober: Roommates by alecmagnuslwb
Graduation is behind them and Magnus and Alec soon find themselves awaiting their roommate assignments for college. Even though they're attending the same university, things won't be the same for the couple. Since they were small children, they've lived within yards of each other, so the thought of potentially living across campus from one another is daunting. However, when Magnus receives the name of his roommate, he can hardly believe his eyes. Never has random selection been so perfect!
The author wrote this chapter in a month-long anthology of fluffy Shadowhunters stories and, so far, this is my favorite. It's just so darn cute! Definitely give this a try. It will leave you wanting to see more...in the best way possible.